Pump and piston therefor



INVENTOR.

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D v MGCONNOHIE PUMP AND PISTON THEREFOR Filed on. 11, 1948 Feb. 3, 1953 Patented Feb. 3, 1953 UNITED STATES PATENT OFFICE PUMP AND PISTON THEREFOR Duane V. McConnohie, Galesburg, Mich.

Application October 11, 1948, Serial No. 53,955

9 Claims. .1

This invention relates to improvements in pump and piston therefor.

The main objects of this invention are:

First, to provide a pump well adapted for use in deep wells and one in which the parts are simple and economical to produce and assemble and at the same time one which is highly efficient and not likely to become inoperative in use.

Second, to provide a piston for well casings or cylinders which can be readily adjusted to use a pair of cupped packing members or pairs of cupped packing members the packing members of the pairs being arranged in oppositely facing relation.

Third, to provide a pump structure having these advantages which the cupped packing .membars are so supported that they cannot become reversed within the cylinder or casing even after becoming substantially worn.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing in which:

Fig. 1 is a fragmentary side elevational view partially in longitudinal structure of a preferred embodiment of my invention.

Fig. 2 is an exploded view with the parts disposed in their relative order.

Fig. 3 is a side elevational view of the piston of my invention as adjusted for an opposed pair of cupped packing members the cylinder or casing being indicated by dotted lines.

In the accompanying drawing I represents a pump casing or cylinder. The foot valve commonly associated therewith is designated by the numeral 2 but details are not illustrated. A section of the pump rod or piston rod is shown at 3. The cylinder is provided with a packing head, designated generally by the numeral 4, and through which the pump rod reciprocates. The packing head 4 is adapted to receive a packing element that seals the upper end of the pump assembly to the inside of the well casing as is common practice. As the foot valve and this packing head form no part of my present invention they are not detailed. The cylinder or casin I is desirably of brass. The packing head 4 is provided with a check valve and slot-like horizontal openings that admit liquid to the top of the cylinder as is common in valves of this type.

The piston of my invention comprises the tubular intermediate body member 5 externally threaded at its upper end to receive the internally threaded upper head body member .6. This head body member is provided with a discharge port I opening to the tubular pump rod 3 the head member having an internally threaded collar-like portion 33 into which the piston rod is fed. The inner end of the head body member is provided with an annular abutment 9 projecting radially outward relative to the intermediate body memher. The head member has an inwardly faced conical valve seat to and is provided with a plurality oi angularly spaced ports H opening to this valve seat and to the casing above the abutment '9.

The bottom body member I2 is threaded into the lower end of the intermediate body member and is provided with an annular flange-like abutment IS. The bottom body member has an inlet port M surrounded by the inwardly facing conical valve seat I5.

I provide a plurality of cupped packings or leathers, as they are commonly called, these being designated in the accompanying drawing by the numerals I6 and IT for convenience in description although they are duplicates. The packing members l l are arranged to face outwardly with their base flanges It in supported engagement with the abutments 9 of the head body member and with the abutment it of the bottom body member.

Packing supporting rings is are arranged on the inner sides of the base flanges of these outer packing members and the base flanges 18 of the inner packing members It are disposed in sup' ported relation to these rings.

The clamping and spacing sleeve 201 is arranged in concentric spaced relation to the intermediate body member with its ends in supporting clamping engagement with the base flanges of the inner packing members as is shown in Fig. 1. The body members are adjustably associated in the embodiment illustrated through their threads so that the spacing and clamping members and the supporting rings are securely clamped in their assembled relation. The intermediate body member has one or more side openings 2| opening between the inwardly facing or inner packing members while the sleeve 20: has a side opening 22. This subjects the inwardly facing packing members to the pressure within the plunger or piston.

The inlet valve '23 is desirably formed of rubber of suitable hardness and is shouldered to provide a neck '23! receiving the lower end of the coil spring 2 2. The upper end of this coil spring engages the neck 25 on the valve 25 also of rubber. This valve "26 has a central port 2? therethrough opening to the discharge port of the head member. The valve 26 coacts with the valve seat I0 closing the ports I on the down stroke of the piston and opening the same on the up stroke to permit the water in the cylinder above the pi..- ton to flow into the piston and to be discharged on the up or discharge stroke. The inlet valve 23 is opened on the down stroke but is closed on the up stroke. With this arrangement of valves the single spring 24 serves to yieldingly urge or bias them to their seats. lhe inlet valves 23 and 26 and the piston thus coact with the upper and lower check valves in the packing head and foot valve respectively to form a familiar type of double acting pump.

One of the advantages of my present invention is that the piston may be assembled with two pairs of packing members, as shown in Fig. l, or with a pair of packing members as shown in Fig. 3. When adapted for a single pair of inwardly facing packing members, as shown in Fig. 3, the outwardly facing packings H are omitted or removed allowing the rings H! to seat upon the abutments of the head and bottom members.

The relationship of the packing members It to the rings is the same as in Fig. 1 as is also the spacing and clamping sleeve 26!. The abutment rings l8 are of such radial dimensions that their outer edges are adjacent to but spaced from the casing or cylinder wall as is shown. It will be noted that they are in overlapping relation or in supporting relation to the merging zones of the base flanges of the packing flanges with their skirt portions thereby eifectively supporting the packings largely relieving the same of flexing stress at this zone thereby prolonging the life of the packings and also preventing reversal of the packings within the casing even after they become very flexible from wear or the like. At the same time the skirts of the packings are entirely free to conform to the wall of the cylinder.

I have illustrated and described my invention in a highly practical commercial embodiment thereof. The structure is highly eificient and at the same time the parts may be quite economically produced, the intermediate body member and the sleeve being formed of tubular stock and the end body members being screw machine parts. The parts may .be easily and quickly assembled. Should occasion require the parts may be disassembled for renewal or replacement of the packing members.

I have not attempted to illustrate various adaptations and embodiments of my invention as it is believed that this disclosure will enable those skilled'in the art to embody or adapt my invention as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a pump having a casing and a tubular piston rod, a piston reciprocable in said casing and comprising a cylindrical tubular intermedidiate body member having a side opening spaced from its ends, a head body member threaded upon said intermediate body member and having an annular packing member seat at its inner end projecting radially relative to the intermediate body member, said head member being threaded at its outer end to receive said piston rod and having a central discharge port communicating with the piston rod and surrounded by an inwardly facing valve seat, there being aplurality of ports formed through said head body member and opening to said valve seat and to the casing above the said packing member seat of said head member, a bottom body member threaded into said intermediate body member and having a second annular packing member seat projecting radially relative to the intermediate body member and having a central inlet port opening to said intermediate body member and surrounded by a second inwardly facing valve seat, outer cupped packing members disposed in outwardly facing relation with base flanges in supported engagement with said packing member seats of said head and bottom body members, packing member supporting rings disposed at the inner sides of the base flanges of said outer packing members, inner cupped packing members disposed in inwardly facing relation with base flanges in supported engagement with said rings, a packing member clamping and spacing sleeve disposed in concentric spaced relation to said intermediate body member with its ends in supporting engagement with the base flanges of the inner inwardly facing packing members, such sleeve having rib-like enlargements at its ends, the packing members and the said several supporting and clamping elements being subjected to clamping stress by the adjustment of at least one of said body members, the said sleeve having an opening therein between the inner packing members, the said rings being of such radial width as to overlap the merging zones of the skirt portions of the packing member with their base flanges, thereby preventing reversing of the cupped packing member skirts within the casing, an inlet valve coacting with said inlet port and said second valve seat, a second valve having a port opening to the said discharge port and coacting with said seat in said head body member and with the said ports opening thereto, and a coil spring arranged between said valves to yieldingly urge them to their seats.

2. In a pump having a casing and a tubular piston rod, a piston reciprocable in said casing and comprising a cylindrical tubular intermediate body member having a side opening spaced from its ends, a head body member having an annular packing member seat at its inner end projecting radially relative to the intermediate body member, said head member being connected to said piston rod and having a central discharge port communicating with the piston rod and surrounded by an inwardly facing valve seat, there being a plurality of ports formed through said head body member and opening to said valve seat and to the casing above the said packing memberseat of said head member, a bottom body member having a second annular packing member seat projecting radially relative to the intermediate body member and having a central inlet port opening to said intermediate body member and surrounded by a second inwardly facing valve seat, outer cupped packing members disposed in outwardly facing relation with base flanges in supported engagement with said packing member seats of said head and bottom body members, packing member supporting rings disposed at the inner sides of the base flanges of said outer packing members, inner cupped packing members disposed in inwardly facing relation with base flanges in supported engagement with said rings, a packing member clamping and spacing sleeve disposed in concentric spaced relation to said intermeidate body member with its ends in supporting engagement with the base flanges of the inner inwardly facing packing members, the said sleeve having an opening therein between the inner packing members. an inlet valve coacting with said inlet port and said second valve seat, and a second valve havinga port opening to the said discharge port and coacting with said seat in said head body member and with the said ports opening thereto, said valves being spring biased.

3. A pump piston for use with a casing and a tubular piston rod comprising a cylindrical tubular intermediate body member having a side opening spaced from its ends, a head body member threadedly engaging said intermediate body member and having an annular packing member seat projecting radially relative to the intermediate body member, said head member being adapted for connection to a hollow piston rod and having a central discharge port surrounded by an inwardly facing valve seat, there being a plurality of angularly spaced ports formed through said head body member and opening to said valve seat from above said packing member seat, a bottom body member 'threadedly engaging said intermediate body member and having a second annular packing member seat projecting radially relative to the intermediate body member and having an inlet port opening to said intermediate body member, outer cupped packing members disposed in outwardly facing relation with base flanges in supported engagement with said packing member seats of said head and bottom body members, packing member abutment rings disposed at the inner sides of the base flanges of said outer packing members, inner cupped packing members disposed in inwardly facing relation with base flanges in supported engagement with said rings, a packing member clamping and spacing sleeve disposed in concentric spaced relation to said intermediate body member with its ends in supporting engagement with the base flanges of the inwardly facing packing members, the several packing members and the said rings and sleeve being'subjected to clamping stress by the adjustment of at least one of said body members, said sleeve having an opening therein between the inner packing members, an inlet valve coacting with said inlet port, a second valve having an opening therein opening to the discharge port of the head body member and coacting with said valve seat therein and with the said ports opening thereto, and a coil spring arranged between said valves to yieldingly urge them to their seats.

4. A pump piston for use with a casing and a tubular piston rod comprising a cylindrical tubular intermediate body member having a side opening spaced from its ends, a head body member on said intermediate body member and having an annular packing member seat projecting radially relative to the intermediate body member, said head member having a central discharge po'rt surrounded by an inwardly facing valve seat, there being a port formed through said head body member and opening to said valve seat from above said packing member seat, a bottom body member on said intermediate body member and having a second annular packing member seat projecting radially relative to the intermediate body member and having an inlet port opening to said intermediate body member, outer cupped packing members disposed in outwardly facing relation with base flanges in supported engagement with said packing member seats of said head and bottom body members, packing member abutment rings disposed at the inner sides of the base flange of said outer packing members, inner cupped packing members disposed in inwardly facing relation with base flanges in supported engagement with said rings, a, packing member clamping and spacing sleeve disposed in concentric spaced relation to said intermediate body member with its ends in supporting engagement "with the base flanges of-the inwardly facing packing members, said'sleeve having an opening therein between the inner packing members, an inlet valve coacting with said inlet port, and a second valve having an opening therein opening to the discharge port of the head body member and coacting with said valve seat therein and with the said port opening thereto.

5. In a pump, having a casing and a tubular piston rod, a piston reciprocable in the casing and comprising a tubular intermediate body member having a sideopening therein spaced from its ends, a top body member constituting a packing member abutment and having a discharge port surrounded by a valve seat, there being a plurality of angularly spaced radial ports formed through said head body member and opening to said valve seat and to the casing above the lower end of the 'top body member, a bottom body member constituting a second pack-ing abutment member and provided with an inlet port, pairs of cupped packings the outer of which have skirts arranged in outwardly facing relation with base flanges in supported engagement with said top and bottom body packing member abutments the inner of which also have base flanges and skirts which are disposed to face in wardly, annular disks disposed between the base flanges of the pairs of cupped packing members and extending radially outward into overlapping relation to the merging zones of the skirt portion of the packing members with their base flanges, the peripheries of th disks being closely adjacent to but spaced from the casing thereby preventing reversing of the cupped packing member skirts within the casing, a spacer sleeve provided with a side opening disposed in concentric relation to said body member with its ends in abutting supporting engagement with the base flanges of the inwardly facing packing members and clampingly supporting the same against the said disks, an inlet valve coacting with said inlet port, and a second valve coacting with the 'valve seat of said top body member and having a discharge opening registering with the discharge opening in said top body member.

6. A piston for pumps comprising a cylindrical tubular intermediate body member having a side opening spaced from its ends, a head body member detachably connected withsaid intermediate body member and having an annular packing ring seat at its inner end projecting radially relative to the intermediate body member and having a central, discharge port surrounded by an inwardly facing valve seat, there being a port formed through said head body member and opening to said valve seat from above the packing member seat of said head member, a bottom body member having a second annular packing member seat projecting radially relative to the intermediate body member and having a central inlet port with a second valve seat opening to said intermediate body member, valve elements positioned within said intermediate body member and biased toward said seats, a plurality of cupped packing members having base flanges, packing member supporting rings, said supporting rings each being disposed between a pair of oppositely facing packing members, said pairs of packing members being located around said intermediate body member in supported relation to the packing member seats of said top and bottom body members, a sleeve disposed in concentrio spaced relation to said intermediate body member with its ends in supporting clamping engagement with packing members having their base flanges in supported engagement with said rings, at least one of said body members being axially adjustable relative to the others whereby said pairs of opposed packing members and the supporting rings may be adjustably clamped between the head and bottom body members and the ends of said sleeve. V

7. A piston for pumps comprising a cylindrical tubular intermediate body member having a side opening spaced from its ends, a headbody member detachably connected with said intermediate body member and having an annular packing ring seat at its inner end projecting radially rela} tive to the intermediate body member and having a central discharge port surrounded by an inwardly facing valve seat, there being a port formed through said'head body member and opening to said valve seat from above the packing member seat of said head member, a bottom body member detachably connected to the bottom of said intermediate body member and having a second annular packing member seat projecting radially relative to the intermediate body member and having an inlet port with a second valve seat opening to said intermediate body member, valve elementspositioned within said intermediate body member and biased toward said seats, a plurality of cupped packing members having base flanges, packing member supporting rings, said supporting rings each being disposed between a pair of oppositely facing packing members, said pairs of packing members being located around said intermediate body member in supported relation to the packing member seats of said top and bottom body members, a sleeve disposed in concentric spaced relation to said intermediate body member with its ends in supporting clamping engagement with packing members having their base flanges in supported engagement with said rings.

8. A pump piston comprising a cylindrical tubular intermediate body member having a side opening spaced from its ends, a head body member threadedly engaging said intermediate body member and constituting and abutment, said head member being adapted for connection to a hollow piston rod, and having a discharge port surrounded by an inwardly facing valve seat, there being a port formed through said head body member and opening through said valve seat to the exterior ofsaid head body member above said abutment a bottom body member threadedly engaging said intermediate body member and constituting a second abutment and having an inlet port with asecond valve seat opening to said intermediate body member, rings disposed in supported relation .to said abutments, cupped packing members having base flanges and disposed with their base flanges in supported engagement with said rings, a packing member clamping and spacing sleeve disposed in concentric spaced relation to said intermediate body member with its ends in supporting engagement with the base flanges of the packing members, the packing members and the said rings and sleeve being subjected to clamping stress by the threaded adjustment of at least one of said body members, said sleeve having an opening therein between the packing members, an inlet valve coacting with said inlet port, and a valve having an opening therein opening to the discharge port of the head body member and coacting with said valve seat therein and with the port opening thereto.

9. A pump piston comprising a cylindrical tubular intermediate body member having a side opening spaced from its ends, a head body member connected to said intermediate body member and constituting an abutment, said head member having a discharge port surrounded by an inwardly facing valve seat, there being a port formed through said head body member and opening through said valve seat to the exterior of said head body member above said abutment, a bottom body member connected to said inter-' mediate body member and constituting a second abutment opposed to said first abutment and having an inlet port opening to said intermediate body member, rings'disposed in supported relation to said abutments, cupped packing members having base flanges and disposed with their base flanges in supported engagement with said rings, a packing member clamping sleeve disposed around to said intermediate body member with its ends in supporting engagement with the base flanges of the packing members, said sleeve having an opening therein between the packing members, an inlet valve coacting with said inlet port, and a valve having an opening therein opening to the discharge port of the head body member and coacting with said valve seat therein and with the port opening thereto.

DUANE v. McCONNOl-IIE.

REFERENCES orrnn McConnohie Aug. 10, 1943 

